Answer is: b) blue.
Neutral litmus paper turns red in acidic solutions and turns blue in alkaline solutions. At neutral pH, litmus paper does not change color.
Acids and bases have opposite properties and have the ability to neutralize each other. Acids taste sour, give sharp stinging pain in a wound and react with metals to produce hydrogen gas.
Bases turn red litmus paper blue and acids turn blue litmus paper red.
jenny want to determine if a new brand name wahing detergent is better than her old detergent.she washes ten dirty t-shirts with her new washing detergent and ten dirty t-shirts with the old detergent.identify the dependant and independent variables for this experiment
hint:consider what the treatment is in the experiment
a comet is approaching earth what happens to the earths gravitational pull as the comet gets closer to the ground
After data are collected, they are often arranged in a(n)
Which electromagnetic wave has the longest wavelength?
6.285×103 mg = __________ kg. Express your answer with the appropriate number of significant figures.
The temperature of a sample of water is changed from 10°C to 30°C. The same change in Kelvin would be A) 20 B) 100 C) 273 D) 303
The temperature of a sample of water is changed from 10°C to 30°C. The same change in Kelvin would be 20 K. Thus option A is correct.
What is temperature?Temperature is defined as a measurement of an object or substance's warmth or coldness in relation to a reference value.
Temperature can also be defined as the average kinetic energy of the particles in an object.
Temperature scale is defined as a means of indicating or measuring temperature in relation to a unit of measurement and a starting point (0 or zero).
There are basically three types of temperature scale we use.
Celsius scaleKelvin scaleFahrenheit scaleThus, the temperature of a sample of water is changed from 10°C to 30°C. The same change in Kelvin would be 20 K. Thus option A is correct.
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If a mineral has a metallic shine to it, which property of a mineral is being measured
The property of the mineral is luster.
A metallic luster would reflect light the same way as a metal would.
D- Luster is your answer
What is asubstance that flows Called
The data from one particular experiment do not agree with a current theory. What is the next step?
Answer:
The correct answer will be-repeat the data to verify and support the results.
Explanation:
The scientific theory is based on the repeated experiments which provide and support the theory.
If the data from the new experiment or any particular experiment does not support the theory then the step to be performed will be to repeat the experiment with the same protocol by different experimenters.
This repetition of the experiment increases the efficiency of the data and help determine whether the data can act as evidence of the theory or not.
Thus, repeat the data to verify and support the results is the correct answer.
The first picture is for the first question and the second picture is for the 2nd question
Which is the topmost layer of the rock?
Layer A
Layer B
Layer C
Layer D
Which statement about the rock fossils is true?
Organism X existed for a short period of time.
Organism Y became extinct before organism X.
Organism X and organism Y existed at the same time.
Organism Z became extinct much before organism X.
Scientists find an artifact next to an index fossil. What can they conclude about the unknown age of the artifact?
The artifact is older than the index fossil.
The artifact is younger than the index fossil.
The artifact is approximately the same age as the index fossil.
The artifact's age is not related to that of the index fossil.
What process uses analysis of the decay of atomic particles to determine exact age?
Radioactive dating
Law of superposition
Relative dating
Geologic time
Answer:
1. B
3. C
4. its radioactive dating i learned about this
In term of molecules explain what happen to a sugar cube when it is placed into a beaker of water
The molecules of sugar will dissolves completely in water when the sugar cube is placed in it and it forms a homogeneous solution.
What is solution?A solution is formed when a solute dissolves in a solvent. For example salt when dissolved in water forms the salt solution. The solute can be partially or completely soluble in the solvent.
The solute if completely miscible in the solvent and no phase separation occurs there such as in salt solution, it is called homogenous solution.
Whereas, in some solutions, the solute only partially dissolves in the solvent and forms a phase separation from solvent. Suc solution are called heterogeneous solution.
The solubility of solute depends on the mass, bond type, temperature etc. Here, the sugar molecules are completely soluble in water. Water can forms hydrogen bonds with the OH groups of sugar molecules and it forms a homogeneous solution.
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You serve a volley ball with a mass of 2.1 kg. The ball leaves your hand with the speed of 30 m/s. The ball has __________ energy. calculate it
How does thermal energy from the sun cause water to evaporate
Thermal energy from the sun heats water in various forms on Earth, causing molecules with sufficient energy to transition into water vapor, a process called evaporation. This evaporation contributes to the water cycle, storing energy as latent heat and influencing weather and climate patterns.
Thermal energy from the sun is crucial to the water cycle, specifically the evaporation of water. When the sun's energy reaches the Earth, it heats bodies of water such as oceans, lakes, and streams. As water absorbs this heat, the average kinetic energy of water molecules increases and some molecules gain enough energy to overcome the attractive forces holding them in the liquid. This process causes those water molecules to escape into the air as water vapor.
Evaporation doesn't just happen over water bodies; it can also occur from land surfaces and within soil where there is moisture. The energy from the sun also contributes to the process of sublimation, where ice and snow convert directly into water vapor without becoming liquid first. Plants play a part through transpiration, which is the release of water vapor into the atmosphere from plant leaves.
An important concept to understand is that during evaporation, the energy of the sun is stored as latent heat in the water vapor. This latent heat is released when water vapor condenses to form clouds, which then can lead to precipitation, completing a part of the water cycle. The continuous exchange of heat energy, facilitated by the sun, is fundamental in driving weather and climate patterns across the globe.
Why do giraffes have long necks that allow them to eat leaves in trees? A. for acquiring energy
B. for reproducing
C. for maintaining structure
D. for protection
What does erosion do?
A. breaks rocks apart
B. cements sediments
C. moves bits of rock and soil
D. forms rocks
Answer:
C. Moves bits of rocks and soil
Explanation:
as learnt in elementary, weathering is the geological process of breaking rocks and sediments apart. Which means the answer is not A.
Also the sediments is part of the rock cycle so we can eleminate B
And erosion is the geoloical term of moving rocks and sediments into other places depending on the type of erosion. Which proves the answer might be C, But lets chech D first.
Phyical changes forms rocks, so the answer is not D
Which narrows back down to C, which is how we got our answer.
Hope it helps
how should the student label each circle in the diagram
Answer:
Reaction A is chemical, Reaction B is nuclear
Explanation:
When cellular respiration occurs, food energy is converted into chemical energy in the way of ATP, ______ and _____ are the products of this process. Spell check
what do all electrolytes have in common?
Final answer:
Electrolytes share the property of being able to conduct electricity when in solution because they dissociate into ions. Ions like sodium, potassium, and chloride are vital for body functions such as nerve transmission and water balance. Nonelectrolytes, which do not dissociate into ions, cannot conduct electricity.
Explanation:
All electrolytes have the common property of being able to conduct an electric current when dissolved in water or melted. This is because electrolytes are composed of ions, which are electrically charged particles. When these ions are in solution, they move towards electrodes of opposite charge, enabling the flow of electricity. For instance, when sodium, potassium, and chloride dissolve in water, they dissociate into Na+, K+, and Cl- ions, respectively. This dissociation into ions is what makes these substances electrolytic.
Sodium, potassium, and chloride are particularly important in the human body for their roles in nerve impulse conduction, muscle contractions, and regulating water balance. They, along with other cations like calcium and magnesium and anions such as bicarbonate, phosphate, sulfate, organic acids, and proteins, help maintain the body's ionic balance, acid-base balance, and osmotic pressure in bodily fluids. Electrolytes are crucial for maintaining life processes.
By contrast, nonelectrolytes do not dissociate into ions and therefore do not conduct electricity when dissolved or melted. Substances such as glucose and ethylene glycol are examples of nonelectrolytes.
Elements that have the lowest density of all the metals are called
1.Why is there more mass in a metal spoon compared to a plastic spoon?
Metals have higher density than plastics. Hence they weigh more on small volume. Therefore a metal spoon has higher mass than a plastic spoon.
What is density ?Density of an object is the measure of the mass per unit volume of the substance. It describes how closely its particles are packed in its volume. The density of a substance depends on the bond type, pressure and temperature as well.
Metals are electropositive elements with greater densities. The metallic particles are held together by strong metal - metal bonds. This makes the metal lattice denser and hard.
Therefore, a metal spoon will have greater density and thereby mass in a given volume than plastic spoon which is of very less density compared to the metals.
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Which of these is an indication that a chemical reaction has occurred?
A.The melting of a substance
B.The boiling of a substance
C. The formation of precipatation
D The freezing of a substance
Please & Thank you!
A gas occupies 200 mL at -73°C. To have the same gas occupy 300 mL:Should the temperature be increased or decreased?
Answer:
decreased i think
Explanation:
In the periodic table, which elements had complete outer shells? Also include name and symbol
Do water molecules leave or enter a cell in an isotonic solution?
What is a hypothesis?
Answer:
a possible explanation or answer to a scientific question that is based on prior knowledge or research and is testable
What is the number of moles of atoms in 1.035 kg of lead
Answer:-
5 mol of Lead
3.01 x 10^24 atoms of Lead
Explanation:-
Mass of lead = 1.035 kg x 1000 = 1035 g
Atomic mass of Lead = 207.2 g mol-1
Number of moles of lead = Mass / atomic mass
= 1035 g / 207.2 g mol-1
=5 mol
By Avogadro's Law we know 1 mol of an element has 6.02 x 10^23 atoms
So 5 mol of Lead has 5 x 6.02 x 10^23
= 3.01 x 10^24 atoms of Lead
what does an atomic number represent in an atom?
Answer:
The atomic number is the number of protons in the nucleus of an atom.
Explanation:
Atoms have 3 main subparticles: protons, neutrons and electrons. Protons have positive charge, neutrons don't have any charge, and electrons have negative charge. Both protons and neutrons are located in the nucleus while electrons move around the nucleus.
Is there any way to predict the exact location of any, one marble drop on the target?
No, there is no way to predict the exact location of a marble drop due to various factors that influence its motion. However, we can make mathematical predictions and calculate the range of possible locations based on initial conditions and the laws of physics.
Explanation:No, there is no way to predict the exact location of any one marble drop on the target. The reason for this is that the motion of a marble, or any object, is influenced by various factors such as air resistance, initial velocity, and the surface it is dropping on. These factors can introduce variability into the motion, making it difficult to predict the exact landing spot.
However, we can make mathematical predictions and calculate the range of possible locations for the marble to land based on the initial conditions and the laws of physics.
To better understand the motion of objects in free fall, you can perform the take-home experiment as suggested. By dropping a marble, a ball, a spoon, and a piece of paper from the same height, you can observe how the objects behave and make observations about their motion.
The fossil record provides evidence of past life as well as clues to the past climate, environment, and abiotic factors in an area. True or false
The fossil record provides evidence of past life as well as clues to the past climate, environment, and abiotic factors in an area. This statement is true.
What is abiotic factor ?Abiotic elements, also known as abiotic factors, are non-living chemical and physical elements of the environment that have an impact on the health of living things and the operation of ecosystems. Biology as a whole is supported by abiotic causes and the phenomena that go along with them.
Abiotic variables including water, sunshine, oxygen, soil, and temperature are crucial.
Abiotic factors are non-living elements like water, soil, and atmosphere, whereas biotic factors are live entities found in an ecosystem including plants, animals, and bacteria. In an ecosystem, how these elements interact is crucial.
Thus, The fossil record provides evidence of past life as well as clues to the past climate, environment, and abiotic factors in an area. This statement is true.
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ANSWER ASAP! PLEASE DOUBLE CHECK!
How do instantaneous speed and average speed differ?
Instantaneous speed happens all the time, but average speed only happens once per hour.
Instantaneous speed is always faster than average speed.
Instantaneous speed is the speed of an object at a specific time, but average speed is the total distance over the total time.
Instantaneous speed is always slower than average speed.
Answer:
Explanation is given below.
Explanation:
It is very easy to understand the difference between average speed and instantaneous speed.
The explanation given by you are rewritten in the correct way.
The instantaneous speed is the speed of an object at a particular instance of time while its moving or covered some distance or just started moving. For example finding the speed of your car at 20th minute after you depart from your home no matter you have to travel more to reach the destination. Its not correct to say that average speed happens per hour but, the average speed is the total distance covered by an object per unit total time taken by the object to cover that distance.Its not necessary that instantaneous speed will always be more than the average speed. It can differ.The statement is right that: Instantaneous speed is the speed of an object at a specific time, but average speed is the total distance over the total time. As it is described above. Its not necessary that instantaneous speed will always faster or slower than average speed as described in point number 2, but while finding the AVERAGE speed the total time will always more than instantaneous time.Answer:
Lets cut to the chase.
Explanation:
Its C. i took the test